TOPIC CONTAINS SPOILERS
This episode I really enjoyed the scenes with Rick. The telephone was a very clever way of showing insanity, I could not have done it better, I'm just saying I've never been more amazed by a "Becoming insane" scene than this one.
The rest of the episode for me was really just moving the story along. Kind of like a bridge, stuff happens yeah, but it really didn't impress me compared to the telephone scene.